Introduction:
The magnetic field of the earth is an important tool for navigation among birds. 18 species of birds have magnetic compass to aid them in their seasonal migration and home navigation. The magnetic compass was first described for European robins. Captive individuals of migrants become restless in their cages at the time of the year when their migration usually starts. They also preferred to stay at the side of the cage pointing to their migrating destination. This behavior was used to analyze the orientation of the birds in a laboratory where magnetic fields can be varied in a controllable manner. When the magnetic north was rotated by coil systems, while the field¡¦s total intensity and inclination where held constant, the birds altered their directional preferences according to the change in the magnetic north [1]. This behavior clearly indicates that the birds used the magnetic field for direction finding.

As a result of bird¡¦s dependence on the......

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Title: Magnetoreception
Approximate Word Count: 5488
Approximate Pages: 22 (250 words per double-spaced page)

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